LCD Sub-Pixel Voltage Control for Lateral Visibility
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Solution Overview
Problem
Vertically aligned mode liquid crystal displays (LCDs) face challenges in achieving lateral visibility comparable to front visibility due to rapid transmittance changes across pixels, which results in a reduced aperture ratio and suboptimal image quality.
Innovation Solution
The LCD design divides a single pixel into multiple sub-pixel regions, with different voltages applied to each sub-pixel, utilizing a variable resistor and switching elements to control voltage distribution, thereby adjusting transmittance and improving aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single pixel is divided into two sub-pixels with different voltages to improve lateral visibility, then lateral visibility is improved, but the aperture ratio is reduced due to additional switching elements and voltage division components
Solution Approach 1:
The pixel is divided into first and second sub-pixels with different voltages applied to them, creating a gradient in transmittance across the pixel. This segmentation allows different regions of the pixel to display different brightness levels, improving lateral visibility by reducing the abrupt contrast changes between adjacent pixels.
Solution Approach 2:
Different voltages are applied to different sub-pixels within the same pixel region, creating local variations in transmittance. The first sub-pixel receives a first voltage while the second sub-pixel receives a second voltage, allowing precise control over the brightness distribution within the pixel to optimize both front and lateral visibility.
2Illumination intensity
If multiple switching elements are added to control sub-pixels for improved visibility, then visibility is improved, but device complexity increases
Solution Approach 1:
The switching elements control not only the sub-pixels but also the voltage division ratio between them through the variable resistor. This multi-functional control allows a single switching element configuration to manage both the on/off state of sub-pixels and the voltage distribution, reducing the need for additional dedicated voltage control components.
Solution Approach 2:
A variable resistor is introduced to dynamically adjust the voltage division ratio between the first and second sub-pixels. This dynamic control mechanism allows the system to adapt the voltage distribution in real-time based on display requirements, improving visibility while maintaining manageable device complexity through programmable resistance adjustment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances lateral visibility by stabilizing transmittance changes across the pixel, improving aperture ratio and image quality by allowing for more precise control of electric fields and brightness distribution.
Implementation Method 1
an electric field is generated in the liquid crystal layer by applying a voltage to the field-generating electrodes, an orientation of liquid crystal molecules of the liquid crystal layer is determined by the generated electric field, and an image is displayed by controlling a polarization of incident light
Implementation Method 2
a variable resistor which drops an output voltage of the second switching element and applies the dropped output voltage to the second sub-pixel electrode
Data Source
AI summary
A liquid crystal display includes a first substrate on which a first sub-pixel electrode and a second sub-pixel electrode are spaced apart from each other in a first direction, different voltages being applied to the first sub-pixel electrode and the second sub-pixel electrode, a first switching element which controls a voltage applied to the first sub-pixel electrode, a second switching element which controls a voltage applied to the second sub-pixel electrode, a variable resistor which drops an output voltage of the second switching element and apply the dropped output voltage to the second sub-pixel electrode, a second substrate on which a common electrode is disposed, and a liquid crystal layer disposed between the first substrate and the second substrate.